Machine for freezing ice-cream.



A. W. DAVIS.

MACHINE FOR FREEZING ICE CREAM.

APPLIOATION FILED JUNE 2, 1909.

Patented Apg. 16, 1910.

| r i I 0 1 l 1 l I i I I b INVENTOR WITNESSES ATTORNEY ASA W. DAVIS, OFBRIDGEPCRT, CONNECTICUT.

MACHINE FOR FREEZING- ICE-CREAM.

Specification of Iletters Patent.

Application filed June 2, 1969. Serial No. 499,704.

To all whom it may concern:

Be it known that I, Asa "W. DAVIS, a c'iti' zen of the Ilnited States,residing at Bridgeport, county of Fail-field, State of Connecti Ill cut,have invented an Improvement in Machines for Freezing lce-(lream, ofwhich the following is a specification.

This invention has for its object to provide a machine for freezing icecream and similar uses, which shall be simple in construction, durable,not liable to get out of repair, relatively inexpensive to build, whichwill produce an exceedingly low tempera ture and will therefore freezethe cream quickl and which may be operated at a mere raction of the costof operating other machines of this character now in use.

. With these and other objects in view I have devised the novel freezingmachine of which the following description in connection with theaccompanying drawing is a specification, reference characters being usedto indicate the several parts.

l igure 1 is a view partly in elevation and partly in section,illustrating the construe tion and operation of mynovel machine as awhole; Fig. 2 a section of the barrel on the line 2-2 in Fig. 1, lookingin the direction of the arrows; Fig. 3 a section onthe line 3-3 in Fig.1, looking in the direction of the arrow; and Fig. l is a detailsectional view on the line H in Fig. 3. l

10 denotes a tank in which a barrel 11 is mounted to rotate. Una of thejournals of the barrel, indicated specifically by 12, eX- tends throughthe tank and is providedwith means for imparting rotation thereto, asfor example a crank, or a sprocket wheel 13 over which a drivingsprocket chain (not shown) passes. The tank is secured at a suitableelevation above the other parts of the machine in any suitable manner,as for example by means of a bracket 14:. The barrel is provided with anopening 15 for convenience in filling it with a freezing mixture as saltand ice, said opening being provided with a cover 16 which is secured.in place in any suitable manner (not shown). At the ends of the barrelare openings 17 covered on the inner side with screens 18 whichretainthe ice and salt therein but permit the intensely cold brineformed by the melting of the ice and salt to escape freely. The brinepasses from the tank by means of a pipe 19 to a circular freezingchamber 20. The outer wall of the freezing Patented Aug. Id, 1910.

chamber and the wall and cover of the tank I may be made of any suitableheat insulating or non-conducting material. ,The freezing chamber 21 isformed of a cylindrical receptacle. provided with a single bottom walland double side walls, a dasher 22of any ordinary or preferredconstruction being mounted to rotate therein.

23 denotes the cover of the freezing chamher which is readily removable,is provided with an internal flange 24 to retain it in position and-witha central hub 25 through which a journal 26 of the dasher passes. 27denotes a shaft which detachably engages journal 26 and carries asprocket wheel 28 or other suitable means for imparting rotationto theshaft and dasher. The upper end ofshaft 27 is supported in a suitableframe 29 extending upward from the freezing chamber.

The vitally important feature of the freezing chamber is a series ofannular brine cells 30 formed between the spaced apart side walls of theforegoing chamber. The walls of these annular brine cells are made ofmetal and any required number of cells may be used and placed one abovethe other, as clearly shown in Figs. 1" and l. Each cell is providedwith a vertical transverse wall 31 and with openings 33 in its upper andlower walls, the openings of each chamber being on opposite sldes' ofthe verticaltransverse wall.

It will be. noted that the wall of insuside walls of the freezingchamberand projects over-the topmost brine cell.

In usethe barrel is charged with broken ice and salt and is caused torotate. The in tensely cold brine produced by the melting of the ice andsalt passes from the tank to the up er circular brine cell which itenters throug an opening 33 close to the vertical transverse wall.Before the brine can escape from this cell it must pass entirely aroundthe cell and then pass out through an opening 33 on the opposite side ofthe transverse wall. The same thing is repeated in the superposed cellsfrom top to bottom, the intensely cold brine passing into each circularcell through an opening contiguous to the transverse wall, then passingentirely around the cell to the oppositeside of the transverse wallwhere it asses through an o ening 33 into the cell be ow. It will benote that the crosssection of the brine cells is relatively small,consequently the entire series of cells is filled by a relatively smallamount of intensely cold brine. Owing to the fact that' brine cannotpass out of any cell until it has passed entirel around it, the passagethrough the ce ls is relatively slow and the cells are kept filled withconstantly changing intensely cold brine with a very smallconsumption'of ice and salt. Having reached the lower cell the brinepasses out through an escape pipe 34 which is carried upward tosufficient height to retard without preventing the flow of brine throughthe cells.

The bottom of the freezing chamber is provided with an openin 35 for theremoval of frozen cream, WlllCh is closed by a tapering plug 36 carriedby an arm 37 hinged to the bottom of the tank and provided at its outerend with a cam 39; The plug is locked in place by means of a lever 40having an opening 38 which receives the end of the arm freely and across piece 41 which engages the cam and forces the plug into theopening.

-An important feature of the present invention is the ease with whichthe freezing chamber can be cleaned. Shaft 27 may be readily detachedfrom the journal of the dasher and removed from the frame. The cover 23is then removed and the dasher lifted out. Every part of the machine iseemoa thus readily detachable and is so perfectly sibrpple inconstruction as to be readi y cleansa e.

Having thus described my invention I claim:

In a machine for freezing ice cream, the combination with a freezingchamber formed of a cylindrical receptacle rovided with double spacedapart side wal s united by a single integral bottom wall, a plurality ofbrine cells being formed between said spaced apart walls, each cell beinprovided with a transverse wall and openings in its upper and lowerwalls on opposite sides respectively of the transverse wall, and a acketof insulating material surrounding the bottom and side walls of saidfreezing chamber and also the top wall of the topmost brine cell,

of a removable cover for said freezin chamber, a dasher Within saidfreezing c amber, means for supplying brine to said cells, an outlet 0ening extending through the bottom walls of said insulating acket andsaid freezing chamber, and a closure for said opening.

In testimony whereof I afiix my signature in presence of two witnesses.

ASA W. DAVIS.

Witnesses:

A. M. Woos'rnn, S. W. A'rrma'ro v.

